Derive the expression for dB in terms of voltage. (b) The input voltage to an amplifier is 5 V. If the voltage gain of the amplifier is 40 dB, calculate the value of the output voltage. Express 0.2W in dBm. [5 marks) [3 marks) The equation for an AM signal is VAM = Ve sin(wet) + mye.cos [(wc - wa)t] - myc.cos ((We + wa)t] 2 15 marks) (e) Name and write equations for two other types of AM signals. A signal of frequencies 5 kHz to 10 kHz is broadcasted by an AM station using a 500 kHz carrier. Draw a labelled diagram of the spectrum of the broadcasted signal. 15 marks) (f) Determine the bandwidth of the AM signal in (e) above. [2 marks]

Answer:

Burj Khalifa is located in dubai UAE at over 828m

Explanation:

828 metres

Answer:

The Burji Khalifa, known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. With a total hight of 829.8 m and a roof hight of 828 m, the Burji Khalifa has been the tallest structure and building in the world since its topping out in 2009.

According to the basic principles of Electrical Resistance Welding, Resistance welding is used to fuse two metals together. See further explanation below.

It is to be noted that Electrical Resistance Welding comprises a welding head that exerts pressure and holds the metal between its electrodes, as well as a welding power source that applies electric current to the metal to be welded. When force is exerted, resistance creates friction heat.

A weld is a metal coalescence formed by heating to an appropriate temperature with or without pressure, and with or without the introduction of a filler substance.

Resistance welding bonds are classified into three types:

Different materials having dissimilar grain structures, such as molybdenum to tungsten, are bonded utilizing a relatively short heating time, high weld energy, and high force in a solid state bond, also known as a thermo-compression bond.

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In Excel, to build a dashboard we need to add a tab and label it as Dashboard. Then, we set a gray background and copy-paste the three pivot charts we have built in the previous steps. Also, we insert slicers for Employee Last Name and Region.

We ensure these slicers dynamically interact with all three charts by selecting each slicer, right mouse clicking, choosing report connections, and selecting the appropriate check boxes. Finally, we test the dashboard to ensure that all of the charts interact with the slicers and when we drill down into the region and employee last names we see the corresponding pivot tables dynamically update as well.The steps to build a dashboard in Excel are as follows:

Step 1: Add a tab and label it as Dashboard

Step 2: Set the gray background

Step 3: Copy-paste the three pivot charts we have built in the previous steps

Step 4: Insert slicers for Employee Last Name and Region

Step 5: Ensure these slicers dynamically interact with all three charts by selecting each slicer, right mouse clicking, choosing report connections and selecting the appropriate check boxes

Step 6: Test the dashboard to ensure that all of the charts interact with the slicers

Step 7: When we drill down into the region and employee last names we see the corresponding pivot tables dynamically update as well.To create a dynamic dashboard, it is important to choose the correct chart types, slicers, and chart sizes and locations. Slicers are used to filter the data in the pivot tables and charts. Charts in Excel can be easily resized, formatted, and customized to make it more attractive and informative to users.To ensure that all of the charts interact with the slicers, we should select each slicer and check if the charts are changing accordingly. Finally, we need to test the dashboard to ensure that it is working as expected.

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Answer:

Explanation:

Wow

Answer:

  C. the object is moving forward

Explanation:

A positive slope means position is increasing when time is increasing. Generally, increasing position is "moving forward."

Answer:

C. The object is moving forward

Answer:

14.5° ; THD % = 3.873 × 100 = 387.3%.

Explanation:

Okay, in this question we are given the following parameters or data or information which is going to assist us in solving the question efficiently and they are;

(1). "500 VAR reactive power from 230 Vrms 50 Hz 1.5 KVAR reactor".

(2). Consideration of up to 12th harmonic.

So, let us delve right into the solution to the question above;

Step one: Calculate the Irms and Irms(12th) by using the formula for the equation below;

Irms = reactive power /Vrms = 500/230 = 2.174 A.

Irms(12th) = 1.5 × 10^3/ 12 × 230 = 0.543 A.

Step two: Calculate the THD.

Before the Calculation of the THD, there is the need to determine the value for the dissociation factor, h.

h = Irms(12th)/Irms = 0.543/ 2.174 = 0.25.

Thus, THD = [1/ (h)^2 - 1 ] ^1/2. = 3.873.

THD % = 3.873 × 100 = 387.3%.

Step four: angle AC - Ac converter

theta = sin^-1 (1.5 × 10^3/ 12 × 500) = 14.5°.

The type of fire extinguisher that would be used on an electric motor that has overheated and caught fire is a CO² fire extinguisher.

CO² fire extinguishers should be used to put out electrical fires. They assist to smother the fire and prevent it from spreading by displacing the oxygen in the air while leaving no residue and so being safe to electrical equipment.

Whenever there is a case of fire from electricity, water is not used in such conditions, this is because water is a good conductor of electricity. If the water comes in contact with the electricity it can cause new problems.

Therefore, the type of fire extinguisher that would be used on an electric motor that has overheated and caught fire is a CO² fire extinguisher.

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The kinematics we can find the time to cross the Atlantic is 67 days.

The kinematics studies the movement of the body making relationships between the position, the speed and the acceleration of the same.

The average velocity is defined as the relation between the displacement between the time of the interval

           v = \(\frac{\Delta x}{t}\)

           Δt = \(\frac{\Delta x}{v}\)

Where v is the velocity, x the displacement t time

In this case they indicate the displacement is Δx = 3000 mi and the speed is v = 50 m / min

The system of units allow data to be exchanged with precision and safety, for this there is currently the international system of measurements (SI), where the unit of length is the meter and the unit of time is the second, let's reduce the magnitudes given to these units.

           Δx = 3000 mi (  ) = 4.828 10⁶ m

            v = 50 m / min ( ) = 0.833 m / s

Now we can calculate the time to cross the Atlantic

            Δt = 4.828 10⁶ / 0.833

            Δt = 5.796 10⁶ s

Let's reduce to days

            Δt = 5.796 10⁶ s (  ) (  )

            Δt = 67 days

In conclusion using kinematics we can find the result of the time to cross the Atlantic is 67 days.

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RAM is called “random access” because any storage location on the computer can be accessed directly (as opposed to randomly).

Answer:

A fan/blower should be used

Explanation:

In a building the air pressure could be positive or negative and each if these depends on the air tightness of the building and could also be caused sometimes by wind and other factors.

When there is positive pressure, we have it that the pressure in the building is more than the outside pressure. Positive pressure also helps with an improvement in the quality of air in a building since it would take out smokes and other particulates.

Therefore to maintain positive pressure a fan or blower should be used.

\(f = force\)

\(m = mass \: of \: an \: object\)

\(a = acceleration\)

Newton's second law is one of the most important in all of physics. For a body whose mass m is constant, it can be written in the form F = ma, where F (force) and a (acceleration) are both vector quantities. If a body has a net force acting on it, it is accelerated in accordance with the equation

Answer:

carried courage buried

Explanation:

its Filipino

Answer:

a) i) The maximum pressure is approximately 122.37 bar

ii) The thermal efficiency is approximately 56.47%

iii) The mean effective pressure is approximately 20.974 bar

b) (b) Four types of internal combustion engine includes;

1) The diesel engine

2) The Otto engine

3) The Brayton engine

4) The Wankel engine

Explanation:

The parameters of the Otto cycle are;

The heat added, \(Q_{in}\) = 2,800 kJ/kg

The compression ratio, r = 8

The beginning compression pressure, P₁ = 1 bar

The beginning compression temperature, T₁ = 300 K

Cp = 1.005 kJ/kg·K

Cv = 0.718 kJ/kg·K

R = 287 kJ/kg·K

K = Cp/Cv = 1.005 kJ/kg·K/(0.718 kJ/kg·K) ≈ 1.4

T₂ = T₁×r^(k - 1)

∴ T₂ = 300 K×8^(1.4 - 1) ≈ 689.219 K

\(\dfrac{P_1\cdot V_1}{T_1} = \dfrac{P_2\cdot V_2}{T_2}\)

\(P_2 = \dfrac{P_1\cdot V_1 \cdot T_2}{T_1 \cdot V_2} = \dfrac{V_1}{V_2} \cdot \dfrac{P_1 \cdot T_2}{T_1 } = r \cdot \dfrac{P_1 \cdot T_2}{T_1 }\)

∴ P₂ = 8 × 1 bar × (689.219K)/300 K ≈ 18.379 bar

\(Q_{in}\) = m·Cv·(T₃ - T₂)

∴ \(Q_{in}\) = 2,800 ≈ 0.718 × (T₃ - 689.219)

T₃ = 2,800/0.718 + 689.219 = 4588.94 K

P₃ = P₂ × (T₃/T₂)

P₃ = 18.379 bar × 4588.94K/(689.219 K) = 122.37 bar

The maximum pressure = P₃ ≈ 122.37 bar

(ii) The thermal efficiency, \(\eta_{Otto}\), is given as follows;

\(\eta_{Otto} = 1 - \dfrac{1}{r^{k - 1}}\)

Therefore, we have;

\(\eta_{Otto} = 1 - \dfrac{1}{8^{1.4 - 1}} \approx 0.5647\)

The thermal efficiency, \(\eta_{Otto}\) ≈ 0.5647

Therefore, the thermal efficiency ≈ 56.47%

(iii) The mean effective pressure, MEP is given as follows;

\(MEP = \dfrac{\left(P_3 - P_1 \cdot r^k \right) \cdot \left(1 - \dfrac{1}{r^{k-1}} \right)}{(k -1)\cdot (r - 1)}\)

Therefore, we get;

\(MEP = \dfrac{\left(122.37 - 1 \times 8^{1.4} \right) \cdot \left(1 - \dfrac{1}{8^{1.4-1}} \right)}{(1.4 -1)\cdot (8 - 1)} \approx 20.974\)

The mean effective pressure, MEP ≈ 20.974 bar

(b) Four types of internal combustion engine includes;

1) The diesel engine; Compression heating is the source of the ignition, with constant pressure combustion

2) The Otto engine which is the internal combustion engine found in cars that make use of gasoline as the source of fuel

The Otto engine cycle comprises of five steps; intake, compression, ignition, expansion and exhaust

3) The Brayton engine works on the principle of the steam turbine

4) The Wankel it follows the pattern of the Otto cycle but it does not have piston strokes

1. Total Number of Employees in Aircraft Repair Shop = Number of People in Engine Overhaul + Number of People in Aircraft Overhaul + Number of People on Engine Operational Checks + Number of People on Airframe Operation Checks + Number of Inspectors + Number of Welders + Number of Foreman= 12 + 27 + 8 + 4 + 3 + 2 + 1= 57 employees.

2. The weight of an empty Boeing 747 is 300000 pounds, fuel load is 25 tons = 50,000 pounds, 300 passengers with an average weight of 170 pounds = 51,000 pounds, 40000 pounds of cargo = 40000 pounds

. So, Gross Weight of Aircraft = Empty Weight + Fuel Load + Passengers Weight + Cargo= 300000 + 50000 + 51000 + 40000= 441,000 pounds.

3. The diameter of the drilled hole is 1.250 inches, so the diameter of the bolt for the hole should be 1.250 inches – 0.003 inches = 1.247 inches.

4. Each tire will have 9 bolts, 1 nut, and 2 washers.

As per the given data, there are 85 bolts, 50 nuts, and 100 washers which can be reused.

Therefore, the total number of bolts, nuts, and washers required for 20 tires are:

Bolts required for 20 tires= Total number of bolts required – bolts which can be reused= (20 × 9) – 85= 35 nuts required for 20 tires= Total number of nuts required – nuts which can be reused= (20 × 9) – 50= 100 washers required for 20 tires= Total number of washers required – washers which can be reused= (20 × 9 × 2) – 100= 260.

So, 35 bolts, 100 nuts, and 260 washers will have to be issued from stock.

5. The piece of tubing of 18 inches is cut into 4 pieces. The saw cut is 1/16 inch wide. So, 4 saw cuts are 4 × 1/16 = 1/4 inch. The total length of the pieces after cutting = 3 + 2 + 6 + 1/4= 11.25 inches.

Therefore, the length of the remaining piece of tubing = 18 – 11.25= 6.75 inches.

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The power property states that loga a^x = x loga a = x.

Rewrite the expression log3 ³√y using the power property below:log3 ³√y = log3 (y^(1/3))= (1/3) log3 yNow, we need to use the given Richter scale formula to find the magnitude R of the earthquake.R = log(a/T) + BWhere,a = 460 micrometersT = 3.7 secondsB = 2.7Magnitude, R = log(a/T) + B= log(460/3.7) + 2.7= log(124.3243) + 2.7= 2.0948 + 2.7= 4.7948Therefore, the magnitude of the earthquake is 4.7948, rounded to four decimal places.Note: The Richter scale ranges from 0 to 10. The magnitude increases by a factor of 10 for each unit increase on the scale. So, a magnitude 5 earthquake is 10 times more powerful than a magnitude 4 earthquake, and a magnitude 6 earthquake is 100 times more powerful than a magnitude 4 earthquake.

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An o ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with a blue stripe or dot.

The values of h at the two internal boundaries are :

Given data :

Z₁ = Z₂ = Z₃ = 25 m

h top = 120 m

h bottom = 100 m

K₁ = 0.0001 m/s

K₂ = 0.0005 m/s

K₃ = 0.0010 m/s

we will apply the formula below since flow is perpendicular to the bedding plane

Keq = \(\frac{Z1 + Z2 + Z3 }{\frac{Z1}{K1}+\frac{Z2}{K2} + \frac{Z3}{K3} }\)  ----- ( 1 )

Insert values given above into equation 1

Therefore ; Keq = 2.307 * 10⁻⁴ m/s

Hydraulic gradient ( Ieq ) = head loss / length

                                          = ( 120 - 100 ) / 3 * 25

                                   Ieq  = 0.266

Given that the flow is perpendicular to bedding plane

q1 = q2 = q3

V₁ = V₂ = V₃ = V

K₁i₁ = K₂i₂ = K₃i₃ = Keq * ieq

Hence :

V = Keq* Ieq

   = 2.307 * 10⁻⁴ * 0.266

   = 6.15 * 10⁻⁵ m/s .

Also;

K₁i₁ =  Keq * ieq = K₂i₂ = K₃i₃

therefore :

  i₁ = 0.615

  i₂ =  0.123

  i₃ = 0.0615

Pressure at point 1 ( i.e. pressure between first two formations )

h₁ = h top - i₁L₁

   = 120 - 0.615 * 25

   = 104.625 m

Pressure at point 2 ( i.e. pressure between the 2nd and 3rd formation )

h₂ = h₁ - i₂L₂

    = 104.625 - 0.123 * 25

    = 101.55 m

Therefore we can conclude that The values of h at the two internal boundaries are :  h₁ = 104.625 m , h₂ = 101.55 m

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Yes, the issue is with the condition of the for loop, it should be i < myList.size() instead of i <= myList.size(). Array indexes start from 0, so the last index of an ArrayList of size n is n-1

The code is a simple Java program that uses an ArrayList to store integers and a for loop to add them up. The issue with the original code is that the condition of the for loop i <= myList.size() causes an ArrayIndexOutOfBoundsException error.

This is because the last index of an ArrayList of size n is n-1, so the for loop should have the condition i < myList.size(). Additionally, the myList.get(i) method returns an Object, so it needs to be cast to an int before adding to total. Fixing these two issues will ensure that the code runs without errors and produces the expected output.

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A project that requires using a pleater, a ruffling foot, or a gathering foot is the creation of a dress.

A pleater, a ruffling foot, and a gathering foot are all accessories for sewing machines or machines themselves that help fashion designers to give the fabric a different shape or texture, and therefore create unique pieces.

All of the tools can be used in the creation of a dress, for example, a pleater can be used in the top section of the dress to give it a nice texture and make it different from the skirt. In the same way, others such as the ruffling foot or the gathering foot can be used in the sleeves of the dress.

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Answer:

Debido a los peligros que presenta un espacio confinado, se requiere que se utilice un sistema de permisos antes de entrar; en donde deberá incluir un listado de lo que hay que revisar y apuntar antes de entrar para controlar al personal y los riesgos posibles. La responsabilidad de sacar al personal, es de servicios de rescate, con equipo de  protección personal y de rescate, incluyendo  respiradores, y adiestramiento sobre cómo utilizarlo. El  personal de servicio de rescate también debe recibir el  adiestramiento de entrantes autorizados y ser  adiestrado para realizar los deberes de rescate asignados.

Until emergency assistance arrives, portable fire extinguishers can put out or manage a fire.

The use of portable fire extinguishers can put out or contain a fire until emergency assistance is received.

Utilize portable units exclusively for small flames or fires that are still in the early stages because their discharge times are often only a few seconds. Make a plan for a getaway. Avoid breathing in the extinguishing agent and smoke by keeping low to the ground.

Only use a portable fire extinguisher when a fire is small, restricted to a single area, and not made up of extremely flammable materials. If the fire becomes out of control, leave the premises right away and get assistance.

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Answer:

a) 0.42

b) Independent

c) 30%

d) 0.88

Explanation:

Person chooses Chicken's item : 70% = 0.7

Person chooses fish's item : 30% = 0.3

Visits in which he orders Afghani Chicken = 60% = 0.6

a) Probability that he goes to KARIM and orders Afghani Chicken:

P = 0.7 * 0.6 = 0.42

b) Two events are said to be independent when occurrence of one event does not affect the probability of the other event's occurrence. Here the person orders Afghani Chicken regardless of where he visits so the events are independent.

c)  P = 0.30 because he orders Afghani Chicken regardless of where he visits.

d)  Let A be the probability that he goes to KARIM:

P(A) = 0.7 * ( 1 - 0.6 ) = 0.28

Let A be the probability that he orders Afghani Chicken:

P(B) =  0.3 * 0.6 = 0.18

Let C be the probability that he goes to KARIM and orders Afghani chicken:

= 0.7 * 0.6 = 0.42

So probability that he goes to KARIM or orders Afghani Chicken or both:

P(A) + P(B) + P(C) = 0.28 + 0.18 + 0.42 = 0.88

Answer:

Composite panel garage doors

Explanation:

Engineered lumber should not be used for composite panel garage doors. Hence, option C is correct.

Horizontal panels are connected to form a single garage door in panel lift doors, sometimes referred to as sectional doors. These panels have wheels attached to them that are positioned in tracks on either side and guide the door through a reasonably sharp turn to reposition it horizontally above the garage door opening.

Yes, however it's crucial to have a pro take their place for the finest outcomes. It can be unsafe for anybody other than a professional to install garage doors due to their complexity and difficulty.

One of the most affordable solutions on the market is an aluminum garage door. They are available in a variety of design options that can complement the exterior style of your home. Low-cost aluminum garage doors.

Thus, option C is correct.

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To convince management to incorporate quality reviews into the project life cycle, it is important to emphasize the benefits of quality reviews in improving project outcomes and reducing risks

1. Convincing management: When advocating for incorporating quality reviews into the project life cycle, it is crucial to highlight the advantages they bring. Quality reviews help identify defects and errors early in the project, leading to improved quality, reduced rework, and enhanced customer satisfaction. They provide an opportunity for team collaboration, knowledge sharing, and continuous improvement. By emphasizing the potential cost savings and improved project outcomes resulting from quality reviews, management can be persuaded of their value. Presenting case studies or success stories from other projects that have benefited from quality reviews can also help support the argument.

2. Quality review models: The choice of quality review models depends on various factors such as project complexity, team size, and available resources. Some common quality review models include walkthroughs, inspections, and peer reviews. Walkthroughs involve a group of team members reviewing project deliverables together, discussing their content, and identifying potential issues. Inspections are more formal and structured, with a designated moderator leading the review process and following predefined checklists or standards. Peer reviews involve team members reviewing each other's work, promoting knowledge sharing and accountability. The specific models to implement can be determined by considering the project's specific needs, available resources, and the team's preferences and expertise. It is also important to establish clear guidelines, roles, and responsibilities for conducting the reviews and ensuring that the feedback and findings from the reviews are appropriately addressed and incorporated into the project.

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Yes, finding a Nash equilibrium in three-person zero-sum games is at least as hard as that in general two-person games due to the increased complexity and the need to balance rewards among multiple players.

In a three-person zero-sum game, the rewards of the three players always sum to zero, which means that any gain by one player results in an equal loss by the other players. Finding a Nash equilibrium in such games is a challenging task.

To understand why finding a Nash equilibrium in three-person zero-sum games is at least as hard as that in general two-person games, we can consider the complexity involved in solving these games.

In general, finding a Nash equilibrium in two-person games is a well-studied problem and can be approached using various algorithms and mathematical techniques.

In three-person zero-sum games, the additional complexity arises from the presence of an extra player and the need to balance rewards among all three players to ensure a zero-sum outcome.

This complexity makes the task of finding a Nash equilibrium more challenging as it requires considering the strategies and payoffs of all three players simultaneously.

Therefore, it can be concluded that finding a Nash equilibrium in three-person zero-sum games is at least as hard as that in general two-person games due to the increased complexity and the need to balance rewards among multiple players.

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